[*/en] Fix typos across all files

[KATANAND]

I've run codespell and typos spell checkers against all english pages. I've carefully filtered out all false positives and manually applied fixes.

typos --exclude '*/' --format brief --sort > TYPOS
# review and make changes
fd -t f -d 1 | xargs codespell > TYPOS
# review and make changes

Please, make sure to skim through the changes and verify that this PR doesn't break any intended logic or introduce regressions.

• I solemnly swear that this is all original content of which I am the original author
• Pull request title is prepended with [language/lang-code] (example [python/fr] for Python in French or [java] for multiple Java translations)
• Pull request touches only one file (or a set of logically related files with similar changes made)
• Content changes are aimed at intermediate to experienced programmers (this is a poor format for explaining fundamental programming concepts)
• If you've changed any part of the YAML Frontmatter, make sure it is formatted according to CONTRIBUTING.md